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Income Taxes - Narrative (Details) - USD ($)			12 Months Ended
	Nov. 05, 2015	Nov. 04, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Release of valuation allowances			$ (57,830,000)	$ (2,949,000)	$ 17,520,000
Insurance company investments			86,811,000	99,645,000
Foreign operating loss carryforward			50,151,000	$ 54,642,000
Net operating losses subject to expiration			146,200,000
Operating loss carryforwards			46,100,000
Amount subject to annual limitation			77,800,000
Operating loss carryforward limitation			2,300,000
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Foreign operating loss carryforward			297,400,000
Net operating losses subject to expiration			1,100,000.0
United Kingdom
Operating Loss Carryforwards [Line Items]
Foreign operating loss carryforward			230,100,000
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			95,300,000
Common Equity
Operating Loss Carryforwards [Line Items]
Issuance and sale of common stock (in shares)	8,452,500	8,452,500		8,459,000	1,500,000
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards			$ 21,600,000

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